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Catalytic ammonia decomposition and tar reduction by a Ni catalyst were studied using a feed gas from a pilot-scale pressurized fluidized-bed gasifier. Tests were conducted in a tubular fixed-bed reactor with a space time of about 3 s at 800-900 degreesC and 12 atm. Ammonia removals of 35-95% and light tar conversions of 90-95% were observed. The amount of the light hydrocarbons was found to have

In 131I SPECT, image quality and quantification accuracy are degraded by object scatter as well as scatter and penetration in the collimator. The characterization of energy and spatial distributions of scatter and penetration performed in this study by Monte Carlo simulation will be useful for the development and evaluation of techniques that compensate for such events in 131I imaging. METHODS: Fi

Efficient protein synthesis in bacteria requires initiation factor 2 (IF2), elongation factors Tu (EF-Tu) and G (EF-G), and release factor 3 (RF3), each of which catalyzes a major step of translation in a GTP-dependent fashion. Previous reports have suggested that recruitment of factors to the ribosome and subsequent GTP hydrolysis involve the dimeric protein L12, which forms a flexible "stalk" on

Popular Abstract in Swedish Ett nytt betygssystem infördes i grundskolan i Sverige 1995. Det tidigare relativa eller normrelaterade systemet ersattes av ett kriterierelaterat, benämnt det mål- och kunskapsrelaterade betygssystemet. Övergången till kriterierelaterade bedömningsprinciper ställer nya och andra krav på lärare. I denna studie undersöks lärares sätt att erfara betygssystemet och dess tiThis thesis reports results from a study that focuses on how teachers experience the criterion-referenced grading system and how they say they use it in their professional work. The empirical study was carried out as semi-structured audiotaped interviews with thirty qualified teachers, in the subjects English, Maths and Swedish. The outcome of the qualitative analysis consists of four parts. In th

Electric field (EF) induced quenching of the fluorescence of large (ca. 10(3) monomers) single chains of MEH-PPV was observed. Directly after application of the field most of the individual MEH-PPV chains were either unaffected by the field or completely quenched by it, while the number of affected molecules increased with the strength of the EF Moreover, application of the field induced fluoresce

BACKGROUND: Diabetes type 1 is associated with an increased risk for infant congenital malformations. It is debated whether this is true also at gestational diabetes. AIMS: To study occurrence of congenital malformations in infants whose mothers had preexisting or gestational diabetes. STUDY DESIGN: A register study covering over 1.2 million Swedish births in 1987-1997 based on the Swedish health

Skriften ger en relativt heltäckande beskrivning av vattenavvisande fasadimpregneringar och ger praktiska råd vid applicering av vattenavvisande preparat. Olika typer av preparat, deras användningsområde, fysikaliska princip och kemiska uppbyggnad beskrivs utförligt.

This report presents the results of two \emph{Escherichia~coli} cultivations performed in a large scale industrial bioreactor. The experiments aimed at evaluating a probing feeding strategy that adresses the problem of acetate accumulation. The principle is to superimpose short pulses in the glucose feed and evaluate the response in the dissolved oxygen signal for the feed adjustments. Simulations

The article concerns selected important issues of poetics and its history. The authors analyze and interpret the history of the notion of the sublime. The article is an introduction to a theoretical part of a book about a possible theory of the literary work of art and communication that results from the experience of the sublime. The introductory article presents to the reader questions which are

Results from sorption measurements at 23 °C on Picea abies in the intervals 54 to 75% RH and 75 to 84% RH are reported. In the higher interval non-Fickian sorption is clearly seen.

The continuous growth of world population and its concentration in the urban areas require food supplies that are continuous, sufficient and of good quality. To resolve this problem techniques have been developed for increasing food quantity and quality. The techniques are applied throughout the food chain from production, conservation and during distribution to the consumers (from "the field to t

A review on the subject of aspirin resistance and its role in vascular diseases is presented. Although the clinical diagnosis of aspirin resistance is frequently made, little is known about its biochemical background. Only a few follow-up studies, with varying design, have dealt with the possible association between an aspirin resistant phenotype and clinical outcome in patients with atherothrombo

Background: Functional polymorphisms of the solute carrier family 22, member 4 (SLC22A4), runt related transcription factor 1 (RUNX1) and small ubiquitin- like modifier 4 (SUMO4) genes have been shown to be associated with several autoimmune diseases. Objective: To test the possible role of these variants in susceptibility to or severity of systemic lupus erythematosus (SLE), on the basis that com